ref: 95944a9760305a80ede481b6e78edd347a1240f7
dir: /bin/cgilib.rc/
# Useful CGI stuff
fn dprint { echo $* >[1=2] }
fn dprintv { { for(v in $*) { echo -n $v^'#'^$#$v^'=' $$v '; ' }; echo } >[1=2] }
fn echo {if(! ~ $1 -n || ! ~ $2 '') /bin/echo $*}
fn escape_html { sed 's/&/\&/g; s/</\</g; s/>/\>/g' $* }
fn http_redirect {
if(~ $1 http://* https://*)
t=$1
if not if(~ $1 /*)
t=$"base_url^$1
if not
t=$"base_url^$"req_path^$1
exec /bin/echo 'Status: '^$2^'
Location: '^$t^'
'
exit
}
fn perm_redirect { http_redirect $1 '301 Moved Permanantly' }
fn post_redirect { http_redirect $1 '303 See Other' }
# Note: should check if content type is application/x-www-form-urlencoded?
# Should compare with http://www.shelldorado.com/scripts/cmds/urlgetopt.txt
fn load_post_args {
if(~ $REQUEST_METHOD POST && ~ $#post_args 0) {
ifs='&
' for(pair in `{cat}) {
ifs='=' { pair=`{echo -n $pair} }
n='post_arg_'^`{echo $pair(1)|urldecode|tr -cd 'a-zA-Z0-9_'}
post_args=( $post_args $n )
ifs=() { $n=`{echo -n $pair(2)|urldecode|tr -d '
'} }
}
pair=()
}
if not
status='No POST or post args already loaded'
}
# Status is () if at least one arg is found. DEPRECATED: access vars directly.
fn get_post_args {
load_post_args
_status='No post arg matches'
for(n in $*) {
v=post_arg_$n
if(! ~ $#$v 0) {
$n=$$v
_status=()
}
}
status=$_status
}
# This seems slightly improve performance, but might depend on httpd buffering behavior.
fn awk_buffer {
awk '{
buf = buf $0"\n"
if(length(buf) > 1400) {
printf "%s", buf
buf = ""
}
}
END { printf "%s", buf }'
}
fn urldecode { $PLAN9/bin/urlencode -d || url_decode} # GROSS
fn url_decode {
awk '
BEGIN {
hextab ["0"] = 0; hextab ["8"] = 8;
hextab ["1"] = 1; hextab ["9"] = 9;
hextab ["2"] = 2; hextab ["A"] = hextab ["a"] = 10
hextab ["3"] = 3; hextab ["B"] = hextab ["b"] = 11;
hextab ["4"] = 4; hextab ["C"] = hextab ["c"] = 12;
hextab ["5"] = 5; hextab ["D"] = hextab ["d"] = 13;
hextab ["6"] = 6; hextab ["E"] = hextab ["e"] = 14;
hextab ["7"] = 7; hextab ["F"] = hextab ["f"] = 15;
}
{
decoded = ""
i = 1
len = length ($0)
while ( i <= len ) {
c = substr ($0, i, 1)
if ( c == "%" ) {
if ( i+2 <= len ) {
c1 = substr ($0, i+1, 1)
c2 = substr ($0, i+2, 1)
if ( hextab [c1] == "" || hextab [c2] == "" ) {
print "WARNING: invalid hex encoding: %" c1 c2 | "cat >&2"
} else {
code = 0 + hextab [c1] * 16 + hextab [c2] + 0
c = sprintf ("%c", code)
i = i + 2
}
} else {
print "WARNING: invalid % encoding: " substr ($0, i, len - i)
}
} else if ( c == "+" ) {
c = " "
}
decoded = decoded c
++i
}
printf "%s", decoded
}
'
}
fn urlencode { $PLAN9/bin/urlencode $* || url_encode } # GROSS
fn url_encode {
awk '
BEGIN {
# We assume an awk implementation that is just plain dumb.
# We will convert an character to its ASCII value with the
# table ord[], and produce two-digit hexadecimal output
# without the printf("%02X") feature.
EOL = "%0A" # "end of line" string (encoded)
split ("1 2 3 4 5 6 7 8 9 A B C D E F", hextab, " ")
hextab [0] = 0
for ( i=1; i<=255; ++i ) ord [ sprintf ("%c", i) "" ] = i + 0
if ("'^$"EncodeEOL^'" == "yes") EncodeEOL = 1; else EncodeEOL = 0
}
{
encoded = ""
for ( i=1; i<=length ($0); ++i ) {
c = substr ($0, i, 1)
if ( c ~ /[a-zA-Z0-9.-]/ ) {
encoded = encoded c # safe character
} else if ( c == " " ) {
encoded = encoded "+" # special handling
} else {
# unsafe character, encode it as a two-digit hex-number
lo = ord [c] % 16
hi = int (ord [c] / 16);
encoded = encoded "%" hextab [hi] hextab [lo]
}
}
if ( EncodeEOL ) {
printf ("%s", encoded EOL)
} else {
print encoded
}
}
END {
#if ( EncodeEOL ) print ""
}
' $*
}
# Cookies
fn set_cookie {
# TODO: should check input values more carefully
name=$1
val=$2
extraHttpHeaders=( $extraHttpHeaders 'Set-cookie: '^$"name^'='^$"val^'; path=/;' )
}
fn get_cookie {
ifs=';' { co=`{echo $HTTP_COOKIE} }
# XXX: we might be adding a trailing new line?
# The ' ?' is needed to deal with '; ' inter-cookie delimiter
{ for(c in $co) echo $c } | sed -n 's/^ ?'$1'=//p'
}
fn static_file {
echo -n 'Content-Type: '
select_mime $1
echo
exec cat $1
}
fn select_mime {
m='text/plain'
if(~ $1 *.css)
m='text/css'
if not if(~ $1 *.ico)
m='image/x-icon'
if not if(~ $1 *.png)
m='image/png'
if not if(~ $1 *.jpg *.jpeg)
m='image/jpeg'
if not if(~ $1 *.gif)
m='image/gif'
if not if(~ $1 *.pdf)
m='application/pdf'
echo $m
}
##############################################
# Generic rc programming helpers
# Manage nested lists
fn ll_add {
_l=$1^_^$#$1
$_l=$*(2-)
$1=( $$1 $_l )
}
# Add to the head: dangerous if you shrink list by hand!
fn ll_addh {
_l=$1^_^$#$1
$_l=$*(2-)
$1=( $_l $$1 )
}
NEW_LINE='
'
# crop_text [max_lenght [ellipsis]]
# TODO: Option to crop only at word-delimiters.
fn crop_text {
m=512
e='...'
if(! ~ $#1 0)
m=$1
if(! ~ $#2 0)
e=$2
awk -v 'max='^$"m -v 'ellipsis='$e '
{
nc += 1 + length;
if(nc > max) {
print substr($0, 1, nc - max) " " ellipsis
exit
}
print
}'
}